Added initial plumbing for UI interface during game
Commit of uncommited file
UI added plus new resources!

Added main banner, number bitmaps for score and bonuses, and finally the
explosions whilst I was at it. Considering implementing health as a
dynamically drawn and rendered rectangle vs a sprite.

Only the UI draws. Need to actually implement concepts that are
reflected on UI before it becomes more useful.
Finally added explosions. Might as well since I added the graphics
resource last commit.